package com.neuedu.corejava.ch9;

import java.util.Scanner;

public class Test {
	public static void main(String[] args) {

		Scanner scanner=new Scanner(System.in);
		String a=scanner.next();
		StringBuffer phonenumber=new StringBuffer();
		phonenumber.append(a);
		phonenumber.replace(3, 7, "****");
		System.out.println(phonenumber);
	}
}
